The Besiktas midfielder is well known to Slaven Bilic.
Sunderland have been linked with the German midfielder.
West Ham United boss Slaven Bilic has spoken on transfer speculation linking him with a move for two top talents in Turkey.
Was the Cameroonian simply an easy deal to bulk out the squad?
The Hammers were apparently in talks to sign the player, when he ruptured knee ligaments.
Besiktas midfielder Tolgay Arslan says he has yet to receive an offer from West Ham.
West Ham United are reportedly interested in Tolgay Arslan of Besiktas.
Arsenal are set to keep a close eye on 24-year-old Hamburg defensive midfielder Tolgay Arslan, according to reports.